Clamp



Jan. 29, 1929.

' J. W. PUTERBAUGH CLAMP Filed May 17. 1927 h IAQVENTCRY.

ATTORNEY:

Patented Jan. 29, 1929.

PATENT OFFICE.

JACK W. PUTERB AUGH, F CINCINNATI, OHIO.

CLAMP.

Application filed May 17,

My inventionrelates more particularly to what is known as screw clamps,comprlsing an elongated C frame with the corresponding clamp membermounted in lower end of the C frame, and having a screw-threadedengagement therewith to be adjusted into clamping position by rotationof the screw.

As ordinarily constructed, it takes considerable time to bring thescrew-threaded member into clamping position, andthe same loss of timeis experienced in opening up the clamp for subsequent adjustment. Then,due to the length of the screw, theordinary construction is apt to befar from rigid.

It is'to avoid this delay in adjustment and to give strength andrigidity to the device that my invention is directed, and it consists ofthat certain novel construction and arrangement of parts to behereinafter par- 2 ticularly pointed out and claimed.

In the drawings Figure 1 is aside elevation of my improved Cclamp. aFigure 2 is an enlarged longitudinal secv 2 tion on the line 2, 2, ofFigure 1.

Figure 3 is a similar cross section on the lines 3-3 of Figure 1.

The clamp comprises the usual C frame 1 provided with a flattened clampmember 2. The other clampmember embodies a head 3 which has swivelledengagement with the bar "or rod 4 which is mounted in an elongatedsleeve 5. The lower end of the rod 4 has screw-threaded engagement withthe sleeve as shown at 6. The sleeve is mounted to slide vertically inthe elongated boss 7 at the lower end of the C frame, and is providedwith a longitudinal rib 8 formed with teeth 01' notches 9 which areengaged by, a pawl 10 pivoted on pin 12 in a lug on the frame. The pawlis pressed into engagement with the notches 9 by spring pin 13. Theinclination of the teeth or notches permits of raising the clamp member3 to engagement with the work by pushing up on the handle 14 attached tothe screw-threaded end ofthe bar 4.

The pawl will engage the proper notch,

1927. Serial No. 192,091.

and a turn of the handle 14 will firmly clamp the work. To release theclamp, the screw is slightly reversed and the entire member is releasedby the operative press on the outer end of the holding pawllO whichswings out of engagement with the notches.

Thus, in a moments time, the clamp can be released and readjusted, and asingle turn of the handle 14 is all that is necessary for tightening andreadjustment. The pawl rests with its heel 15 on the frame, so thatthere is no strain on the pivot pin 12. The particular advantage of soarranging-the pivoted pawl that its heel is in actual contact withthe'base of the slot in the lug in which it is pivoted, is that thestress exerted when the clamp.is tightened is directed directly againstthe metal to metal contact, thus provided, so that all shearing strainon the pivot pin is avoided. As this type of clamp is often used forvery heavy work more satisfactory work can be obtained and the danger toworkmen of the clamp suddenly releasing the Work is avoided.

The mounting of the sleeve in the elongated the engagement of the rib inthe slot in the boss prevents the sleeve from rotating as the screw onthe rod is turned by the handle.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is c A clamp comprisingin combination a C-shaped frame, a sliding sleeve having ratchet teeth thereon and havinga. clamping rod boss gives rigidity to the construction,'and v

